Casing-spear.



UNITED STATES.

Patented September 22, 1903.

PATENT OFFICE.- I

WILLIAM STOCKTON AND WILLIAM HELFENST- EIN, OF BAKERSFIELD,

CALIFORNIA.

CASING-:SPEAR.

SPECIFICATION forming part of Letters Patent No. (39,454, dated September 22, 1903.

Application filed July 30, 1901 To all whom it may concern.-

Beitknownthatwe,WILLIAMW. STOCKTON and WILLIAM HELFENSTEIN, citizens of the United States, residing atBakersfield, in the county of Kern and State of California, have invented a new and useful Casing-Spear, of which the following is a specification.

The objects of this invention are extreme simplicity and ease and certainty of operation.

The accompanying drawings illustrate our invention.

Figure I is a view of our newly-invented casing-spear in a well-casing, which is shown invertical mid section. Fragments are broken away to contract the view. Fig.'II is a vertical mid-section on line 11- II, Figs. I and IILshoWing the position of parts when the spear is being withdrawn from the casing. Fig. III is a plan on line III III, Fig. I. Fig. IV is an enlarged view of the detachable shoulder for driving the collar down.

1 indicates a mandrel having a straight upperportion a and an upwardly-tapering lower portion 6. 2 indicates a collar around said 1 upper portion. 3' indicates a plurality of slips around said mandrel below said collar. Sliding connections are provided connecting said slips with said collar. Such connections preferably consist in U -bolts 4 and eyebolts 5, sliding on the U-bolts. Preferably there are three slips having recesses 6 on their inner faces, converging upwardly to conform with the taper of the tapered portion 19 of the mandrel, so that when the mandrel is drawn up or the collar is lowered down upon the mandrel the slips will be .expanded.

7 indicates catches or dogs on the mandrel, normally above the collar 2, but adapted to pass down through the collar and to catch the collar to uplift the same.

8 indicates a detachable shoulder clamped upon the mandrel a above the catches or dogs. The purpose of this is to enable the operator to jar the tool loose in case the slips should not become, released from the casing when the mandrel is lowered. to bring the dogs below the collar. Preferably this shoulder con- Serial l lo. 70,291. (No model.)

sists in a separable ring fastened together by suitable means in a gain 9.in the mandrel. 10 indicates bolts for fastening the members of the separable shoulder together. i

, The outside of the slips 3 is preferably provided with diagonal corrugations c to give the slips a better hold upon .the casing.

In practical use the spear will be lowered into the well, the collar being below the dogs '7, and as the mandrelis lowered the slips carried by said mandrel will slip loosely down to follow the mandrel into the well. When the spear has been lowered to the appropriate place, the mandrel will be updrawn, thus immediately expanding the slips against the casing, and thereby drawing the casing.

To release the spear, the mandrel will be suddenly lowered, thus passing the dogs 7 down through the collar 2 to catch the collar. Then the mandrel will be drawn up,thus drawing up the collar and the slips carried thereby. The catch formed by said dogs will thus engage the collar for holding the slips from operative engagement with the wedge and the tool may readily be withdrawn from the casing. v

The casing-spear will be fastened on an ordinary stringof tools, including a stem 12 and jars, (not shown,) in the ordinary manner.

' The casing-spears will be made of different sizes for diiferent diameters of casing; but the range of each spear maybe made to extend over several sizes ofcasing.

13 indicates ashoulder on the mandrel to engage shoulders 14. on the slips to support the slips when the mandrel is fully drawn up and the slips are expanded to their utmost extent. e r

What we c1ai1n,and desire to secure by Letters Patent of the United States, is--' 1 A casing-spear comprising a mandrel having a straight upper portion and an upwardly-taperin g lower portion a collar around said upper portion; slips around'said mandrel below said collar; slides connecting said slips with said collar; and catches on said the same.

- low said collar; and slides formed of U-bolts,

and eyebolts sliding on the U-bolts connecting the slips with the collar.

at. A casing-spear comprising a mandrel having a straight upper portion and a tapering lower portion; a collar surrounding said mandrel; slips around said mandrel below said collar; slides connecting said slips with said collar; catches on said mandrel to catch beneath the collar to lift the same; said mandrel being furnished with shoulders to catch the slips when they are extended to their utmost.

5. A casing-spear comprising a wedge-like mandrel, a collar loosely mounted on the mandrel above the wedge, and a series of independent slips loosely suspended from said collar.

G. A casing-spear comprising a wedge like mandrel, a collar loosely mounted on the mandrel above the wedge, a series of slips sus-- pended from the collar, and a catch in the mandrel in position for engaging with the collar and for holding the slips from opera tive engagement with the wedge.

7. A casing-spear comprising a wedge-like mandrel, a collar loosely mounted on the mandrel above the wedge, a series of slips suspended from the collar, and. catches mounted in the mandrel above the wedge in position to be passed down through the collar for engagement with the lower face thereof and for holding the slips from operative engagement with the wedge.

8. A casing-spear comprising awedge-like mandrel, a collar loosely mounted on the mandrel above the Wedge, a series of slips connected with the collar, and spring-actuated catches in the mandrel above the collar in position to be passed down through the collar, said catches being pivotally secured at their lower ends in the mandrel, and the upper end of each catch being shouldered for engaging with the collar and for holding the slips from operative engagement with the wedge.

In testimony whereof we have signed our names to this specification, in the presence of two subscribin g witnesses, at Bakersfield, in the county of Kern and State of California, this 24th day of July, 1901.

lVlLLIAM W". STOCKTON. \VILLIAM IIELF'ENSTEIN.

lVitnesses:

H. F. CONDICT, II. J UTSON. 

